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Wyatt tapped his claws on the desk, waiting for the doctor to return with his test results. Hopefully this would be it - he'd get some pills, maybe a routine procedure, everything would be ok again. No more sleepless nights, no more crazy appetite... The bear wondered if he could nip out to the vending machine before the doctor returned.

"Sorry to keep you waiting," said Dr. Rinlor, bursting into the room as quietly as a dinosaur could. "This is my colleague Dr. Michaels from the parasitology department."

The door closed behind him, but Wyatt didn't see anyone else come in... until he looked down. Dr. Michaels was a mouse - soft-furred and wee, maybe 6ft tall at most. Presumably borrowed from the non-macro wing of the hospital. He smiled warmly and clambered up onto a seat in the corner.

Dr. Rinlor double-checked his notes and tried to put on a sympathetic face for his patient, despite all the teeth and such. "We've confirmed that you have a worm inhabiting your intestine," he said. "Quite an unusual one, in fact."

Wyatt squirmed a little at the thought of it inside him.

"There is good news though - it doesn't appear to be very strongly embedded. It should be a simple matter to remove. We can perform the procedure today and, with your permission, Dr. Michaels would like to take the parasite away for further study. Is that ok with you?"

Wyatt shrugged. He wasn't the type to get sentimental about his buttworms. "Yeah, um, I guess. Do whatever you want with it. What's the procedure?"

Rinlor stared into space for a moment, looking for the words. "It's, ah, very simple. Very safe. But some people do find it, well, mildly uncomfortabl--"

"Basically we just pull it out through your b-hole," said Dr. Michaels. "Or if you're touchy about people poking around back there you can go for surgery."

"R-right," said Dr. Rinlor. The mouse's blunt demeanor made him blush, but he was grateful for the interruption. As a doctor, he had no problem talking about sensitive parts of the body. But as a razor-clawed monster with a history of making patients run away screaming, he had to tread rather carefully. "It's up to you, Wyatt. Which would you prefer?"

"Um, I dunno really," said the bear. "Pulling it out seems quicker. Let's just get it over with."

Both doctors nodded and got out of their seats. Michaels made his way to the supply cupboard, while Rinlor led his patient over to the fancy mechanical bed by the wall.

"I'll leave you in Dr. Michaels' smaller, less jagged, and indeed very capable hands," said the dinosaur. "I'll just be over here if you need me."

Soon everyone was ready to go. Michaels snapped on a pair of scary latex gloves - the kind with sleeves up to the elbow - and lowered the bed so he could reach Wyatt, who was waiting patiently on all-fours with his ass up in the air. Rinlor closed the blinds for privacy, and settled down to observe.

"Ok let's see what we got here," said Michaels, eye-to-eye with his patient's anus. The big black sphincter clenched a bit as he inspected it, like it was shy. He dunked one hand into a bucket of lube and used the other hand to spread it all the way up to his elbow. "Shouldn't be too deep inside, but you never know..."

Wyatt gulped and steeled himself. He tried his best to relax as he felt the doctor poke around, alternating sensations of hot breath and cold lube on his asshole.

"You ready man?" said the mouse, two fingers ready at the entrance.

"Y-yeah, go for it."

The doctor slipped his fingers inside, then the rest of his hand up to the wrist. It wasn't much of a stretch given the size difference between them, though it was enough to make Wyatt bite his lip.

"Oh yeah, don't worry if you pop a boner ok? We're all grown-ups here."

The bear rattled in agreement, stifling his real reaction. It felt great. He'd have to try this at home with one of his small friends - maybe that rabbit...

Michaels pushed further into the soft passage, feeling around all the inner walls, looking for anything that didn't belong. "Actually I'd be worried if you didn't, you know, get a bit hard with my fist on your... ah! Shut up a minute!"

"W-what?"

"I think I found it..." The mouse reached in even deeper, most of his forearm now inside the bear's backside. He could feel something smooth and firm at his fingertips, and it moved when he tried to grasp it. "Ugh yeah, that's it, but it's running away. Gonna surprise it, you ready?"

"You're gonna do wh-- aagh!" Wyatt gritted his teeth and clawed a hole in the sheets as the doctor thrust into him several inches at once. His cock squeezed out a glob of precum so thick it hit the bed with an audible splat.

"Gotcha! Haha!"

Michaels shot Rinlor a thumbs-up, only to realise he was no longer there. At some point amid the chaos there had been a knock at the door, and now he was outside talking to a nurse. After a few moments he poked his large head back in.

"I'm needed elsewhere, shouldn't be more than five minutes," he said.

Michaels smiled at the dinosaur and waved him off with his free hand. "Take your time doctor, I've got this under control."

Rinlor nodded, slamming the door on the nurse who was trying to see what all the lewd noises were about. The moment they left, Michaels felt a tug on his arm that made him jump. He had a firm grip on the worm now, but likewise, the worm was coiling itself around his hand. As hard as he tried to pull it out, the worm pulled back.

"Huh... little stronger than I expected," said the mouse. "Nothing to worry about though!"

He patted Wyatt on the butt to reassure him, then braced himself with his foot on the bed and pulled as hard as he could. Grunting and straining he just barely overpowered the parasite, moving it slowly, inch by arduous inch. A puddle formed under Wyatt as the struggle vibrated through his body. Finally, Michaels saw it - that smooth, white-ish tip poking out above his wrist. The worm writhed and squeezed in objection to the cool open air.

"Just a liiittle bit further..." Michaels eked out a few more inches, then grabbed the worm with his other hand. Its body was tapered, getting fatter and fatter as he pulled it out further - he could barely get his fingers around it this far along, but with some considerable effort he managed to get a good grip. "Aha! I win!" he said, thinking the extra strength would make it easier to pull out the rest of the way.

Unfortunately - and kind of ironically given its lack of legs - the worm was one step ahead. It slipped through the mouse's lubricated grasp and wrapped itself around his other hand as well. Then it pulled, much harder and faster than it seemed capable of before, dragging both of Dr. Michaels' fists back through Wyatt's musky pucker.

The bear gasped. He wasn't sure what was going on back there but he couldn't help enjoying it. His cock cried out for attention... as inappropriate as that would be.

Michaels kicked out and knocked down a trolley looking for leverage against the parasite, but it was no use. His arms vanished steadily into his patient, soon to be followed by his head. He whined as his face met the bear's sweaty asshole, and cried as it swallowed him up in its awful warmth.

The worm pulled him inexorably deeper and deeper into its soft, cozy lair. Up to his chest... up to his waist... up to his knees in stink and slime. Then the walls closed in even tighter - Wyatt had lost control to the assault on his prostate, gushing cum all over the hospital bed, unwittingly bearing down on the resident parasitologist inside his colon. In all the confusion, the worm untied itself from Michaels' wrists. He wasn't going anywhere now. It slithered back a little and pointed itself at his face, almost like it was staring him down. A hole formed in its fleshy tip - slowly at first, then suddenly gaping open to show Michaels an even slimier, deadlier passage than the one he was in. The worm clamped its maw over its prey and began to do what it did best. Suck. Slurp. Consume.

Dr. Rinlor returned just in time to see his colleague's toes slip inside Wyatt's anus - the poor bear lying passed out, bloated, in a pool of his own fluids. The doctor leapt for the phone. A few minutes and a lot of shouting later, they were all on their way to the operating theatre for plan B. Hopefully the surgeons could remove the worm and cut it open before it digested its meal... though wouldn't it be a shame to kill such a rare specimen without study?

The head of parasitology walked into the theatre with a bundle of cash. No one seems to know what happened after that.